Kaolin rotary kiln clinker cooling negative pressure conveying system

Abstract

The utility model discloses a clinker cooling negative pressure conveying system of a kaolin rotary kiln. The device is characterized in that the rotary kiln is provided with a discharging shield, the rotary kiln, an air cooler, a water bath cooler, a cyclone dust collector, a bag dust collector and a negative pressure dust collecting fan are sequentially connected through a negative pressure material conveying air pipe, and smoke dust collected in the cyclone dust collector and the bag dust collector is discharged through the negative pressure dust collecting fan. Discharge pipes of the cyclone dust collector and the cloth bag dust collector are connected with the silo; the sensor assembly comprises a temperature sensor, a pressure difference transmitter and a flow sensor, and the sensor assembly and the electric control valve are arranged at an outlet of the rotary kiln, an inlet of the air cooler, an inlet and an outlet of the water bath cooler, an inlet of the cyclone dust collector and an inlet and an outlet of the bag collector. And the control center is connected with each sensor assembly and the electric control valve. According to the utility model, the clinker can be conveyed and cooled in an efficient and energy-saving manner, and the conveying and cooling process can be intelligently monitored.

Description

Technical Field

[0001] This utility model relates to the field of kaolin processing, specifically to a kaolin rotary kiln clinker cooling and negative pressure conveying system. Background Technology

[0002] In the field of mineral processing, kaolin plays an indispensable role in many industries such as ceramics, papermaking, rubber, and plastics due to its unique physicochemical properties. The rotary kiln, as an important piece of equipment in kaolin processing, uses high-temperature calcination to cause kaolin to undergo physicochemical changes such as dehydration, decomposition, and phase transformation, thereby improving its whiteness, porosity, and activity.

[0003] However, existing kaolin rotary kiln clinker processing systems often use mechanical equipment for clinker conveying. However, the clinker temperature can reach as high as 900℃, and the mechanical equipment will deform and become blocked due to the high temperature, resulting in high maintenance costs. Forced air cooling consumes a lot of energy, and water cooling equipment is bulky and the cooling is uneven. There is a lack of intelligent control and monitoring methods. Key parameters such as temperature, pressure and flow rate during clinker conveying and cooling processes often cannot be monitored and controlled in real time, resulting in unstable system operation and difficulty in guaranteeing product quality. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and propose a kaolin rotary kiln clinker cooling negative pressure conveying system. This system can efficiently and energy-savingly complete the conveying and cooling of clinker, avoid equipment deformation, reduce maintenance costs, and achieve a significant and uniform cooling effect. It also provides intelligent monitoring and control of key parameters in the conveying and cooling process to ensure operational stability and guarantee product quality.

[0005] To achieve the above objectives, the present invention proposes the following technical solution:

[0006] A kaolin rotary kiln clinker cooling and negative pressure conveying system includes a rotary kiln, an air cooler, a water bath cooler, a cyclone dust collector, a bag filter dust collector, a negative pressure dust collection fan, a silo, a sensor assembly, an electric regulating valve, and a control center. The rotary kiln is equipped with a discharge hood. The rotary kiln, air cooler, water bath cooler, cyclone dust collector, bag filter dust collector, and negative pressure dust collection fan are sequentially connected through a negative pressure conveying duct. The dust collected in the cyclone dust collector and the bag filter dust collector is discharged through the exhaust pipe of the negative pressure dust collection fan. The discharge pipes of the cyclone dust collector and the bag filter dust collector are connected to the silo.

[0007] The sensor assembly includes a temperature sensor, a differential pressure transmitter, and a flow sensor. The sensor assembly and the electric regulating valve are located at the outlet of the rotary kiln, the inlet of the air cooler, the inlet and outlet of the water bath cooler, the inlet of the cyclone dust collector, and the inlet and outlet of the bag dust collector.

[0008] The input end of the control center is connected to each sensor component, and the output end of the control center is connected to each electric regulating valve. The control center dynamically adjusts the opening degree of the electric regulating valve according to the data fed back by each sensor component, so as to realize the automatic control of cooling temperature, negative pressure intensity and delivery volume.

[0009] Preferably, the discharge cover is located below the rotary kiln outlet to receive high-temperature clinker and prevent dust from overflowing.

[0010] Preferably, the air cooler adopts a multi-stage cyclone cooling structure, with a cold air inlet at the bottom of each cyclone and a hot air outlet at the top. The cold air comes into counter-current contact with the clinker for heat exchange, and the clinker is cooled in one stage by the counter-current cold air.

[0011] Preferably, the water bath cooler includes a closed water cooling tank, an atomizing spray device, and a circulating water system. It performs secondary cooling of clinker through indirect heat exchange via atomizing spray and circulating water. The circulating water system is equipped with a waste heat recovery device to convert the waste heat of the cooling water into usable thermal energy.

[0012] Preferably, the inner wall of the negative pressure conveying duct is provided with a ceramic wear-resistant layer with a temperature resistance rating of ≥1000℃, and the diameter of the negative pressure conveying duct is dynamically matched according to the conveying volume of clinker.

[0013] Preferably, cold air is used for conveying and cooling within the negative pressure conveying duct.

[0014] Preferably, the filter bag material of the bag dust collector is a high-temperature resistant membrane filter material with an operating temperature of ≤200℃, and it is equipped with a pulse back-flushing cleaning device.

[0015] Preferably, the air cooler and the water bath cooler are connected by an inclined negative pressure conveying air duct with an inclination angle of 15° to 30° to accelerate material flow and assist in heat dissipation.

[0016] Preferably, the control center adopts a PLC controller or a DCS control system.

[0017] Both PLC controllers and DCS control systems are existing technologies.

[0018] Specifically, the temperature of the kaolin rotary kiln clinker reaches approximately 900℃. The high-temperature material inside the rotary kiln falls into the discharge hood and is conveyed to the air cooler via a negative pressure conveying duct. After primary cooling by the air cooler, the temperature drops significantly to 300℃. It then enters the water bath cooler via the negative pressure conveying duct for secondary cooling, further reducing the temperature to below 150℃, meeting the process requirements. Finally, it enters the cyclone dust collector and bag filter dust collector via the negative pressure conveying duct, ultimately falling into the silo. The dust collected in the cyclone dust collector and bag filter dust collector is discharged through the exhaust pipe of the negative pressure dust collector fan. The control center dynamically adjusts the opening of the electric regulating valve based on data feedback from various sensor components to achieve automated control of cooling temperature, negative pressure intensity, and conveying volume.

[0019] The beneficial effects of this utility model are as follows:

[0020] This invention utilizes a cooling and conveying method that combines negative pressure cold air conveying with air-cooled and water-cooled cooling to cool and transport clinker. The cooling effect is significant and uniform, the operation is stable, the investment is small, and the maintenance is minimal.

[0021] This invention uses a method of cooling by first using air cooling and then water cooling. The air cooler first reduces most of the heat, and then the water bath cools the product. This can effectively shorten the length of the water bath, thereby reducing the floor space required and saving investment.

[0022] This invention uses negative pressure conveying ducts to transport clinker throughout the entire process, which can effectively prevent material spillage during the clinker process and avoid environmental pollution.

[0023] This invention installs sensor components and electric control valves at the inlet and outlet of each device. The sensor components collect temperature, pressure, and flow rate in real time, and the control center dynamically adjusts the opening of the electric regulating valve based on the feedback signals from the sensor components. This achieves automated control of cooling temperature, negative pressure intensity, and conveying volume, enabling intelligent monitoring of the entire cooling and conveying process, ensuring operational stability, and guaranteeing product quality.

[0024] This invention uses static equipment to cool clinker, which includes an air cooler and a water bath cooler. The cold air is delivered by negative pressure. Before entering the static equipment, some of the heat has already been dissipated through the negative pressure pipes, thus minimizing damage to the equipment, preventing equipment deformation, and reducing maintenance costs.

[0025] By adopting the above solution, this utility model can efficiently and energy-savingly complete the conveying and cooling of clinker, avoid equipment deformation, reduce maintenance costs, and achieve obvious and uniform cooling effect. It also enables intelligent monitoring and control of key parameters in the conveying and cooling system process to ensure operational stability and guarantee product quality. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a flow chart of the device of this utility model.

[0028] In the diagram, 1-rotary kiln, 11-discharge hood, 12-negative pressure conveying air duct, 2-air cooler, 3-water bath cooler, 4-cyclone dust collector, 5-bag dust collector, 6-negative pressure dust collector fan, 61-exhaust pipe, 7-silo, 8-sensor assembly, 9-electric regulating valve, 10-control center. Detailed Implementation

[0029] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0030] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0031] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] First embodiment:

[0034] like Figure 1 As shown, a kaolin rotary kiln clinker cooling negative pressure conveying system includes a rotary kiln 1, an air cooler 2, a water bath cooler 3, a cyclone dust collector 4, a bag dust collector 5, a negative pressure dust collection fan 6, a silo 7, a sensor assembly 8, an electric regulating valve 9, and a control center 10. The rotary kiln 1 is equipped with a discharge cover 11. The rotary kiln 1, air cooler 2, water bath cooler 3, cyclone dust collector 4, bag dust collector 5, and negative pressure dust collection fan 6 are connected in sequence through a negative pressure conveying air pipe 12. The dust collected in the cyclone dust collector 4 and the bag dust collector 5 is discharged through the exhaust pipe 61 of the negative pressure dust collection fan 6. The discharge pipes of the cyclone dust collector 4 and the bag dust collector 5 are connected to the silo 7.

[0035] The sensor assembly 8 includes a temperature sensor, a differential pressure transmitter, and a flow sensor. The sensor assembly 8 and the electric regulating valve 9 are located at the outlet of the rotary kiln 1, the inlet of the air cooler 2, the inlet and outlet of the water bath cooler 3, the inlet of the cyclone dust collector 4, and the inlet and outlet of the bag dust collector 5.

[0036] The input end of the control center 10 is connected to each sensor component 8, and the output end of the control center 10 is connected to each electric regulating valve 9. The control center 10 dynamically adjusts the opening degree of the electric regulating valve 9 according to the data fed back by each sensor component 8, so as to realize the automatic control of cooling temperature, negative pressure intensity and delivery volume.

[0037] Specifically, the clinker temperature in the kaolin rotary kiln 1 reaches approximately 900℃. The high-temperature material inside the rotary kiln 1 falls into the discharge hood 11 and is conveyed to the air cooler 2 via the negative pressure conveying duct 12. After primary cooling in the air cooler 2, the temperature drops significantly to 300℃. It then enters the water bath cooler 3 via the negative pressure conveying duct 12 for secondary cooling, further reducing the temperature to below 150℃, meeting the process requirements. Finally, it enters the cyclone dust collector 4 and the bag dust collector 5 via the negative pressure conveying duct 12 and ultimately falls into the silo 7. The dust collected in the cyclone dust collector 4 and the bag dust collector 5 is discharged through the exhaust pipe 61 of the negative pressure dust collector fan 6. The control center 10 dynamically adjusts the opening of the electric regulating valve 9 based on the data fed back by various sensor components 8 to achieve automated control of cooling temperature, negative pressure intensity, and conveying volume.

[0038] Second embodiment:

[0039] like Figure 1As shown, a kaolin rotary kiln clinker cooling negative pressure conveying system includes a rotary kiln 1, an air cooler 2, a water bath cooler 3, a cyclone dust collector 4, a bag dust collector 5, a negative pressure dust collection fan 6, a silo 7, a sensor assembly 8, an electric regulating valve 9, and a control center 10. The rotary kiln 1 is equipped with a discharge cover 11. The rotary kiln 1, air cooler 2, water bath cooler 3, cyclone dust collector 4, bag dust collector 5, and negative pressure dust collection fan 6 are connected in sequence through a negative pressure conveying air pipe 12. The dust collected in the cyclone dust collector 4 and the bag dust collector 5 is discharged through the exhaust pipe 61 of the negative pressure dust collection fan 6. The discharge pipes of the cyclone dust collector 4 and the bag dust collector 5 are connected to the silo 7.

[0040] The sensor assembly 8 includes a temperature sensor, a differential pressure transmitter, and a flow sensor. The sensor assembly 8 and the electric regulating valve 9 are located at the outlet of the rotary kiln 1, the inlet of the air cooler 2, the inlet and outlet of the water bath cooler 3, the inlet of the cyclone dust collector 4, and the inlet and outlet of the bag dust collector 5.

[0041] The input end of the control center 10 is connected to each sensor component 8, and the output end of the control center 10 is connected to each electric regulating valve 9. The control center 10 dynamically adjusts the opening degree of the electric regulating valve 9 according to the data fed back by each sensor component 8, so as to realize the automatic control of cooling temperature, negative pressure intensity and delivery volume.

[0042] The discharge cover 11 is located below the outlet of the rotary kiln 1 and is used to receive high-temperature clinker and prevent dust from overflowing.

[0043] The air cooler 2 adopts a multi-stage cyclone cooling structure. Each stage of the cyclone has a cold air inlet at the bottom and a hot air outlet at the top. The cold air comes into counter-current contact with the clinker for heat exchange, and the clinker is cooled in the first stage by the counter-current cold air. The water bath cooler 3 includes a sealed water cooling tank, an atomizing spray device and a circulating water system. The clinker is cooled in the second stage by indirect heat exchange between the atomizing spray and the circulating water. The circulating water system is equipped with a waste heat recovery device to convert the waste heat of the cooling water into usable heat energy.

[0044] The air cooler 2 and the water bath cooler 3 are connected by an inclined negative pressure conveying air duct 12 with an inclination angle of 15°~30° to accelerate material flow and assist in heat dissipation.

[0045] The inner wall of the negative pressure conveying duct 12 is provided with a ceramic wear-resistant layer with a temperature resistance rating of ≥1000℃, and the diameter of the negative pressure conveying duct 12 is dynamically matched according to the conveying volume of clinker; cold air is used for conveying and cooling inside the negative pressure conveying duct 12.

[0046] The filter bag of the bag dust collector 5 is made of high-temperature resistant membrane filter material with an operating temperature of ≤200℃, and is equipped with a pulse back-flushing cleaning device.

[0047] The control center 10 adopts a PLC controller or a DCS control system.

[0048] Specifically, the clinker temperature in the kaolin rotary kiln 1 reaches approximately 900℃. The high-temperature material inside the rotary kiln 1 falls into the discharge hood 11 and is conveyed to the air cooler 2 via the negative pressure conveying duct 12. After primary cooling in the air cooler 2, the temperature drops significantly to 300℃. It then enters the water bath cooler 3 via the negative pressure conveying duct 12 for secondary cooling, further reducing the temperature to below 150℃, meeting the process requirements. Finally, it enters the cyclone dust collector 4 and the bag dust collector 5 via the negative pressure conveying duct 12 and ultimately falls into the silo 7. The dust collected in the cyclone dust collector 4 and the bag dust collector 5 is discharged through the exhaust pipe 61 of the negative pressure dust collector fan 6. The control center 10 dynamically adjusts the opening of the electric regulating valve 9 based on the data fed back by various sensor components 8 to achieve automated control of cooling temperature, negative pressure intensity, and conveying volume.

[0049] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high clay rotary kiln clinker cooling and negative pressure conveying system, comprising a rotary kiln and a silo, characterized in that: It also includes an air cooler, a water bath cooler, a cyclone dust collector, a bag filter dust collector, a negative pressure dust collector fan, sensor components, electric regulating valves, and a control center. The rotary kiln is equipped with a discharge hood. The rotary kiln, air cooler, water bath cooler, cyclone dust collector, bag filter dust collector, and negative pressure dust collector fan are connected sequentially through a negative pressure conveying duct. The dust collected in the cyclone dust collector and bag filter dust collector is discharged through the exhaust pipe of the negative pressure dust collector fan. The discharge pipes of the cyclone dust collector and bag filter dust collector are connected to the silo. The sensor components include a temperature sensor, a differential pressure transmitter, and a flow sensor. The sensor components and electric regulating valves are located at the outlet of the rotary kiln, the inlet of the air cooler, the inlet and outlet of the water bath cooler, the inlet of the cyclone dust collector, and the inlet and outlet of the bag filter dust collector. The input end of the control center is connected to each sensor component, and the output end of the control center is connected to each electric regulating valve.

2. The high clay rotary kiln clinker cooling and negative pressure conveying system according to claim 1, characterized in that: The discharge cover is located below the rotary kiln outlet.

3. The high clay rotary kiln clinker cooling and negative pressure conveying system according to claim 1, characterized in that: The air cooler adopts a multi-stage cyclone cooling structure, with a cold air inlet at the bottom and a hot air outlet at the top of each cyclone.

4. The high clay rotary kiln clinker cooling and negative pressure conveying system according to claim 1, characterized in that: The water bath cooler includes a sealed water cooling tank, an atomizing spray device, and a circulating water system, wherein the circulating water system is equipped with a waste heat recovery device.

5. The high clay rotary kiln clinker cooling and negative pressure conveying system according to claim 1, characterized in that: The inner wall of the negative pressure conveying air duct is provided with a ceramic wear-resistant layer with a temperature resistance rating of ≥1000℃.

6. The high clay rotary kiln clinker cooling and negative pressure conveying system according to claim 1, characterized in that: The filter bag of the baghouse dust collector is made of membrane filter material, with an operating temperature of ≤200℃, and is equipped with a pulse back-flushing cleaning device.

7. The high clay rotary kiln clinker cooling and negative pressure conveying system according to claim 1, characterized in that: The air cooler and the water bath cooler are connected by an inclined negative pressure conveying air duct with an inclination angle of 15° to 30°.

8. The high clay rotary kiln clinker cooling and negative pressure conveying system according to claim 1, characterized in that: The control center uses a PLC controller or a DCS control system.

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